client-server communication

Ensure secure data transmission over HTTPS in the absence of officially issued digital certificate

The transmission of (sensitive) data between server and client should be secured, in particular against eavesdropping and man-in-the-middle attack. The client accesses data (which is stored on the server) over HTTP through specific web interface. Hence, the client-server communication should be adapted to HTTP over TLS/SSL (i.e. HTTPS). There is no possibility to receive an officially issued digital certificate from one of the well-known certification authorities (CA). The solution should be simple, and the implementation may not take longer than ca. 2 hours.
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